A parafoil drone designed by the state-owned Aviation Industry Corporation of China conducts 'fog-clearing' operations in Ningbo. The firm says testing for a type of smog-fighting drone will begin soon. Photo: Nandu.com

A parafoil drone designed by the state-owned Aviation Industry Corporation of China conducts 'fog-clearing' operations in Ningbo. The firm says testing for a type of smog-fighting drone will begin soon. Photo: Nandu.com